<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
</html>
<script src="./ajax.js"></script>
<script>
    const xhr = new XMLHttpRequest();


  ajax({
    method:"post",
    url:"/test/fourth",
    // parmars:"?name=jack&age=123",
    header:{"Content-Type":'application/x-www-form-urlencoded'},
    data:{
        name:"jack",
        age:18
    }
  })


  

</script>